Wassily glides for earlier models  

WASSILY CHAIR-

Looking for clip-on glides for tubular frame.

I have two Wassily chairs, authentic Knoll, but of an earlier vintage date. One of the small improvement the newly manufactured Wassily chairs have are a set of "glides". Because the frame is metal, and they tend to slide around a little, they have a tendency to do some damage to hardwood floors. The newly manufactured models have the aforementioned "glides" in the form of little plastic feet that attach to the bottom of the ski in the front and back, slightly lifting the tubular bar up off the floor. Going to the source, I contacted Knoll, and looked into purchasing a set of these glides to add to my older models, but found that they were attached with a screw. I know that drilling a precise hole into a tube without access to a machine-shop is damn near impossible. Drilling one that is also threaded to receive a metal screw... forget about it.

Hence, if I want to use my older Wassily chairs, but not tear up my new bamboo floors, I need another solution.

I'm wondering whether I couldn't use a glide made for some other tubular steel chair, such as a cantilevered Mart Stam or other Breuer design. I know I've seen the ones that clip onto the tube.

Is anyone familiar with these?

I'm going to do some looking around, but I just thought I'd ask- Does anyone know where I might be able to pick up a set of these clip-on glides for a tubular frame chair?

Thank you for any assistance.